Hydrologic controls on soil carbon and nitrogen cycles. I. Modeling scheme

Hydrologic controls on soil carbon and nitrogen cycles. I. Modeling scheme The influence of soil moisture dynamics on soil carbon and nitrogen cycles is analyzed by coupling an existing stochastic soil moisture model (Adv. Water. Resour. 24 (7) (2001) 707; Proc. R. Soc. Lond. A 455 (1999) 3789) to a system of eight nonlinear differential equations that describe the temporal evolution of the organic matter and the mineral nitrogen in the soil at the daily to seasonal time scales. Special attention is devoted to the modeling of the soil moisture control on mineralization and immobilization fluxes, leaching losses, and plant nitrogen uptake, as well as to the role played by the soil organic matter carbon-to-nitrogen ratio in determining mineralization and immobilization. The model allows a detailed analysis of the soil nitrogen cycle as driven by fluctuations in soil moisture at the daily time scale resulting from the stochastic rainfall variability. The complex ensuing dynamics are studied in detail in a companion paper (Adv. Water Resour. 26 (1) (2003) 59), which presents an application to the Nylsvley savanna in South Africa. The model accounts for the soil moisture control on different components of the nitrogen cycle on a wide range of time scales: from the high frequency variability of leaching and uptake due to the nitrate flushes after persistent rainfall following a period of drought, to the low frequency temporal dynamics of the soil organic matter pools. All the fluctuations in the various pools are statistically characterized in relation to their dependence on climate, soil, and vegetation characteristics. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advances in Water Resources Elsevier

Hydrologic controls on soil carbon and nitrogen cycles. I. Modeling scheme

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Abstract

The influence of soil moisture dynamics on soil carbon and nitrogen cycles is analyzed by coupling an existing stochastic soil moisture model (Adv. Water. Resour. 24 (7) (2001) 707; Proc. R. Soc. Lond. A 455 (1999) 3789) to a system of eight nonlinear differential equations that describe the temporal evolution of the organic matter and the mineral nitrogen in the soil at the daily to seasonal time scales. Special attention is devoted to the modeling of the soil moisture control on mineralization and immobilization fluxes, leaching losses, and plant nitrogen uptake, as well as to the role played by the soil organic matter carbon-to-nitrogen ratio in determining mineralization and immobilization. The model allows a detailed analysis of the soil nitrogen cycle as driven by fluctuations in soil moisture at the daily time scale resulting from the stochastic rainfall variability. The complex ensuing dynamics are studied in detail in a companion paper (Adv. Water Resour. 26 (1) (2003) 59), which presents an application to the Nylsvley savanna in South Africa. The model accounts for the soil moisture control on different components of the nitrogen cycle on a wide range of time scales: from the high frequency variability of leaching and uptake due to the nitrate flushes after persistent rainfall following a period of drought, to the low frequency temporal dynamics of the soil organic matter pools. All the fluctuations in the various pools are statistically characterized in relation to their dependence on climate, soil, and vegetation characteristics.

Journal

Advances in Water ResourcesElsevier

Published: Jan 1, 2003

References

  • Effects of land use, climate variation, and N deposition on N cycling and C storage in northern hardwood forests
    Aber, J.D.; Driscoll, C.T.
  • Nitrogen transformation component for SHETRAN catchment nitrate transport modelling
    Birkinshaw, S.J.; Ewen, J.
  • Linear analysis of soil decomposition: insights from the century model
    Bolker, B.J.; Pacala, S.W.; Parton, W.J.
  • Climate and litter quality controls on decomposition: an analysis of modeling approaches
    Moorhead, D.L.; Currie, W.S.; Rastetter, E.B.; Parton, W.J.; Harmon, M.E.
  • Climate and nitrogen controls on the geography and timescales of terrestrial biogeochemical cycling
    Schimel, D.S.; Braswell, B.H.; McKeown, R.; Ojima, D.S.; Parton, W.J.; Pulliam, W.

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